Apparatus for unfitting tubing



1,640,458 1927' w. LEDIG ET AL APPARATUS FOR UNFITTING TUBING Filed May5. 1924 lnvento rsz Willy Ledig, Heinrich Asmussen, by Mag-1 TheirAttorney.

Patented Aug 30,1927. I

WILLY LEZDIG 'AND,HEINRICH' .ASMUSSEN, or BERLIN; GERMANY, Assmnons ZIJOGENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

APPARATUS FOR UNFITTING TUBING.

Application filed m a, 1924, Serial No; 710,926, and in -Germany June 7,i923.

Our invention relates to 'a method of and apparatus for disengaging oreparating the elements of a fitting such as a hose and-stem.

This invention is' particularly adapted vfor use inconnection with themanufacture of j evacuated glass containers such as are used forincandescent lamps and the like.

In the making of evacuated glass containers, especially forincandesccntlamps and similar. apparatus, the bulb is evacuated througha small exhaust tube which is connected to the airpump by means of arubber connection. Upon the evacuation of the bulb, the small'exhausttube is melted off. In the past, that portion of the exhaust tube whichremains in the rubber connection has been wrenched out by means of adrift, a fork ora similar agent; However,'this means that the rubber iscontinually subjected to a lateral stressingso that, after a short time,it becomes defective. This is so because the rubber is widened outduring this process and'thus, the air-tight connection to the air pumpis impaired with the result that nected to the pump.

The present invention covers a device in the case of which, the exhausttube is removed from the rubber hoseby means of drums or. rolls whichmove in opposite dithe exhaust tube so that it is pulled out-in thedirection of its longitudinal" axis without the occurrence of'anylateral stressing of the rubber connection. As a consequence, thematerial of the connection will not be strained nearly as much as it hasbeen in the past and'therefore, the rubber connection can be used muchlonger without any impair\ ment of the 'air-tightconnection.

On the drawing one example 'ofthe construction of the inventionis'shown, Fig. 1 being an elevation and Fig.2 being a plan. The deviceconsists of two conical drums V rection by a common shaft 0 throughbevel gearsd and e, and toothedgears f and g.

line [will be gripped .on both sides by the rollers when it is moved inbetween the lat-,

ofi' position into the discharge position.

air often escapes into the glass bulb, c'on rections and which take holdon both side Of rections, said rollers spaced apartwhereby a and b,which are driven in oppositedi ter and will be "pulled out of h in' thedirection of the arrow. v

Advantageously, the device shown can be used on revolvable pump tablessince, with the conical shape of the drums, the end of the tube to beremoved can be fed in between .the drums laterally until it is takenhold of automatically by them. 'I o this end, the bracket which supportsthe rollers can be moved in the direction of arrow m as soon as the pumptable has moved from the melting- However, the pump table or thatportion of it'which carries the rubber connection can also be movableinv'relation to the drums for the purposeof making the latter take holdof the exhausttube. Through the conical shape of-the drums the furtheradvantage is attained thatthese will always take a safe hold, even inthecase of tubes of different diameters.

What We claim as new and desire to secureby Letters Patent ofithe UnitedStates is 1. In a stem extractor. for usein separating the tube and thestem elements of a fitting, a pair of rollers geared together to rotatein opposite directions, said rollers suitably spaced'apart whereby thestem projecting from a, tube may be gripped by the rollers and extractedfrom the tube.

2; In' a "device for extracting tube and stem elements from a fitting, apair of cone rollers adapted to be rotated in opposite dithe stem inengagement; with a tube maybe gripped between the walls of the cones andextracted While the tube is held.

3. In a stem extractor for use in separating the tube and stem elementsof a fitting, a

- pair of rollers geared "together" to rotate in opposite directions)said rollers suitably spaced apart whereby the stem projecting from thetube maybe gripped by the rollers and extractedfrom .the tube while thetube is held, .said rollers being mounted upon an arm, said arm beingmovably mounted whereby the rollers may gagement with the stem.

4. In a device for extracting a stem from.

be moved into en- -its holder, a pair of surfaces located in proximityand at a slant with respect to each other, whereby the stem may bewedged bemay be inserted between the rollers from the 0 tween the twosurfaces by inserting the stem side and wedged between said rollers, andbetween the surfaces sidewise, and means means'for rotating the rollerstowithdraw for moving said surfaces to withdraw the the stem from theholder. I

stem from the holder. In witness whereof, we have hereunto set 5, In adevice for extracting'a stem from our hands this 16th day of April,1924.

its holder, a air of rollers located in prox imity of eac other andspaced apart to WILLY LEDIG. form a tapering opening whereby'the stem 1HEINR. ASMUSSEN. W

